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Old 11-04-2017, 07:30   #1
2+barplease
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Help !!!!

This is odd, started using the RVR for work everything good then suddenly the engine is like its gone in limp mode. Firing on 2 or 3 cylinders. Then it clears itself and all good. Give it another 10 mins and it goes again.

So changed the plugs it fired up instantly on all 4. Took it down the road give it a bit of welly all good. Turning in my drive its gone again, I let the engine cool down popped the plugs out they all looked ok put them back in along with a set of coil packs just in case and it fires up no problem. 5 mins running and it does it again. Now its getting dark so will have another look when I get home from work.

Seeing that I have spark on all 4 coils could this be a fuel issue? I'm running RC750 injectors, can they cause this type of problem? Or can injectors just break down?

Any help gratefully received chaps.
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Old 11-04-2017, 09:25   #2
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anyone..............
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Old 11-04-2017, 11:38   #3
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I'd check the injectors, when it starts misfiring, unplug an injector at a time to find out which injector it is. Then change that injector over with a different one and see if its the injector or the wiring? That's what I'd do
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Old 11-04-2017, 12:11   #4
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I have heard of injectors going off after 15-20 min of working fine.. so if you are checking them, have someone do a long test..
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Old 11-04-2017, 12:39   #5
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I have heard of injectors going off after 15-20 min of working fine.. so if you are checking them, have someone do a long test..
That seems to be whats happening, it started last week very intermittently
and has got worse. It may pay me to put another set of injectors in it that I know work. Only trouble is they would be 560's and I'm running 750's.
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Old 11-04-2017, 12:15   #6
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That was my next port of call, I hate problems like this.

Thanks for the advice
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Old 12-04-2017, 07:47   #7
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Ok went home fired it up and its missing badly, so took the plugs out had a look and 1 & 4 were wet. Cleaned them off, stuck them back in and fired it up. Running on all 4 as normal

Left it running to get up to temperature, turned it off restarted perfectly. ?

Didn't get time to take it for a blast as was helping my son put the front end back on the black one. So when I get home tonight I'll see what happens.
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Old 12-04-2017, 07:58   #8
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Sounds to me Colin like the injectors aren't spraying right? If the plugs are wet? I'm only guessing but I've seen a good few threads about RC's having a **** spray pattern?
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Old 12-04-2017, 09:38   #9
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Sounds to me Colin like the injectors aren't spraying right? If the plugs are wet? I'm only guessing but I've seen a good few threads about RC's having a **** spray pattern?
You could be right Steve, only thing I can think is that 2 of the injectors are at some point dumping too much fuel in It can't be the spark breaking down as every time I pull the plugs and turn it over they are sparking perfectly. TBH I havent a clue why it doing it, I've ordered an OBD reader so I will have a look if there are fault codes.......Pain up the arris
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Old 12-04-2017, 08:15   #10
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Surely if the plugs are wet it means they're not getting a spark? Ad in light of the intermittent nature of the issue I'd be wondering is the problem was in the ecu or connections on the ignition circuitry.
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Old 12-04-2017, 09:43   #11
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Surely if the plugs are wet it means they're not getting a spark? Ad in light of the intermittent nature of the issue I'd be wondering is the problem was in the ecu or connections on the ignition circuitry.
It was plugs 1 & 4 wet, yet when you put them back in it starts straight up running on all 4 ?

There's deffo a spark on all plugs, unless two are breaking down? But they are brand new NGK plugs, plus I've changed all the coil packs to one's I definitely know are ok.

I think I'll pull the injectors and get them tested, a process of elimination I suppose.
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Old 12-04-2017, 09:49   #12
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Gary at APT does flow testing and cleaning. I think it was him who said RC didn't have the best spray pattern? I was going to ask about an OBD reader !
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Old 12-04-2017, 10:12   #13
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Check plugs are gapped correctly.
Check leads are good and fixed correctly.
Check coil packs are good and fixed properly.

Last edited by kins; 12-04-2017 at 10:15..
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Old 12-04-2017, 10:35   #14
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Check plugs are gapped correctly.
Check leads are good and fixed correctly.
Check coil packs are good and fixed properly.
They are, checked them mutiple times. The spark side seems all good.
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Old 26-04-2017, 12:33   #15
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Quote:
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Check plugs are gapped correctly.
Check leads are good and fixed correctly.
Check coil packs are good and fixed properly.
Damn....













...feels good to be right.
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